E-MU Systems Proteus
keyboard
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Why this number?
The typical used price is the median of 12 used sales observed in the last 90 days, with outliers removed and the figure rounded. An observed sale is often the last asking price rather than a confirmed hammer price.
| Typical used price | €240 | median sold, rounded |
| Most sold between | €210–€280 | 25th to 75th percentile, same window |
| Window | last 90 days | the tightest of 90 days, 6 months and 24 months with 8 used sales |
| Sample | 12 used sales | ok sample |
| By condition | €250 | very good, median of 8 sales, same window |
| 90-day change | −5% | vs the 90 days before |
| Time to sell | — | only counted from listings we watch start to finish; not enough yet |
| Live asks | €509 | typical ask across 8 listings, 112% above typical used |
| Outliers | dropped | beyond 10× the product’s own median: bundles, parts, typos |
| All-time | €230 | 711 used sales, 2016–2026; not used for deals |
| Sales on record | 722 | all-time, all platforms |
Typical prices are rounded (to 5 / 10 / 50 / 100 by size, in whichever currency you read); asks and the chart are exact. As of 19 October 2026. Full method, including what each badge means
For sale right now
The best-priced as cards, a row of them; every other ad as a line, by ask. Each ask is the seller’s own number; the platform’s mark opens the listing. Each one says when we last confirmed it at its source: the price and availability are from that visit, so check the marketplace before you go.
eBay Germany
Price history
What it sold for, quarter by quarter, since Apr 2016: 707 sales in quarters with at least three, and the bars along the floor show how many each quarter. The shaded band is where the middle half of sales landed.
Recent sales by listing date
12 used sales · last 90 days · middle half €210–€280 · ok
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 2 Oct 2026 | €268$300 as sold | very good |  United States | Reverb | Details |
| 25 Sept 2026 | €314$357 as sold | very good |   Lithuania | Reverb | Details |
| 18 Aug 2026 | €223$250 as sold | excellent | United States | Reverb | Details |
| 13 Aug 2026 | €240$269 as sold | good | United States | Reverb | Details |
| 11 Aug 2026 | €186$215 as sold | excellent | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.
Show the last 50 of 722 recorded sales
| Listed | Price | Condition | From | Platform | The listing |
|---|---|---|---|---|---|
| 22 Sept 2026 | €248$280 as sold | very good |  Japan | Reverb | Details |
| 31 Aug 2026 | €645$750 as sold | very good | United States | Reverb | Details |
| 28 Aug 2026 | €129$150 as sold | very good | United States | Reverb | Details |
| 25 Aug 2026 | €173$200 as sold | very good | United States | Reverb | Details |
| 22 Aug 2026 | €216$250 as sold | very good | United States | Reverb | Details |
| 18 Aug 2026 | €258$299 as sold | very good | United States | Reverb | Details |
| 25 Jul 2026 | €300$349 as sold | excellent | United States | Reverb | Details |
| 20 Jul 2026 | €344$400 as sold | excellent | United States | Reverb | Details |
| 7 Jul 2026 | €263$294 as sold | very good | United States | Reverb | Details |
| 7 Jul 2026 | €439$493 as sold | excellent |  United Kingdom | Reverb | Details |
| 2 Jul 2026 | €561$650 as sold | excellent | United States | Reverb | Details |
| 2 Jul 2026 | €258$300 as sold | excellent |  South Korea | Reverb | Details |
| 1 Jul 2026 | €232$270 as sold | very good | Japan | Reverb | Details |
| 1 Jul 2026 | €240$280 as sold | excellent | United States | Reverb | Details |
| 22 Jun 2026 | €253$295 as sold | excellent | United States | Reverb | Details |
| 20 Jun 2026 | €257$299 as sold | excellent | United States | Reverb | Details |
| 20 Jun 2026 | €343$399 as sold | very good | United States | Reverb | Details |
| 11 Jun 2026 | €340$395 as sold | very good | United States | Reverb | Details |
| 9 Jun 2026 | €300$349 as sold | excellent | United States | Reverb | Details |
| 5 Jun 2026 | €365$425 as sold | excellent |  Belgium | Reverb | Details |
| 4 Jun 2026 | €250$290 as sold | very good | Japan | Reverb | Details |
| 2 Jun 2026 | €261$303 as sold | excellent |  Netherlands | Reverb | Details |
| 30 May 2026 | €232$270 as sold | very good | United States | Reverb | Details |
| 30 May 2026 | €292$340 as sold | very good | United Kingdom | Reverb | Details |
| 26 May 2026 | €157$182 as sold | very good |  Czechia | Reverb | Details |
| 23 May 2026 | €253$294 as sold | very good | United States | Reverb | Details |
| 22 May 2026 | €163$190 as sold | very good | United States | Reverb | Details |
| 22 May 2026 | €172$200 as sold | excellent | United States | Reverb | Details |
| 22 May 2026 | €241$280 as sold | excellent | United States | Reverb | Details |
| 3 May 2026 | €241$280 as sold | very good | United States | Reverb | Details |
| 1 May 2026 | €279$325 as sold | excellent | United Kingdom | Reverb | Details |
| 17 Apr 2026 | €258$300 as sold | fair | United States | Reverb | Details |
| 13 Apr 2026 | €254$284 as sold | very good | United States | Reverb | Details |
| 11 Apr 2026 | €194$225 as sold | very good | United States | Reverb | Details |
| 6 Apr 2026 | €191$222 as sold | excellent | United States | Reverb | Details |
| 3 Apr 2026 | €365$425 as sold | excellent | Belgium | Reverb | Details |
| 28 Mar 2026 | €280$325 as sold | excellent |  France | Reverb | Details |
| 25 Mar 2026 | €257$299 as sold | very good | United States | Reverb | Details |
| 22 Mar 2026 | €266$309 as sold | very good | United Kingdom | Reverb | Details |
| 19 Mar 2026 | €237$275 as sold | very good | United States | Reverb | Details |
| 16 Mar 2026 | €285$319 as sold | very good | Japan | Reverb | Details |
| 14 Mar 2026 | €254$295 as sold | excellent | United States | Reverb | Details |
| 4 Mar 2026 | €257$299 as sold | very good | Japan | Reverb | Details |
| 28 Feb 2026 | €602$700 as sold | good | United States | Reverb | Details |
| 23 Feb 2026 | €249$289 as sold | very good | United States | Reverb | Details |
A date is the day the ad went up. Marketplaces do not publish the day a sale closed; each of these had sold by the time we recorded it, in August 2026 and October 2026. A price is what the listing last asked, converted at that day’s rate.
Cheapest live: 
Germany €395 · Japan €395 · before shipping
In one paragraph
The page's figures as one paragraph, assembled for quoting; not written by hand.
Sellers are asking a median of €509 for the E-MU Systems Proteus today, 112% over the €240 it actually sells for (12 recorded sales, last 90 days; most sold between €210 and €280). The sale median is down 7% on the €258 of the 90 days before. There are 8 listings live right now across eBay Germany, from €395 asking. Figures computed 19 October 2026 by Doirado from cross-platform listing data.