The Allen 100 was introduced in 1971.
Most of the drivers Allen used through late 60's were made by Magnavox, many of them private labeled. In tone and pricing, think of them as "poor man's" Jensens. They don't have the same buzz with the pro audio crowd as the vintage Jensen drivers. But they are very, very nice.
In the early 70's Allen took some speaker manufacturing in-house, and contracted the rest out in a variety of private label deals. Even the EIA codes were sometimes "special" to mask the actual manufacturer. While the quality was still quite good, the drivers are even more obscure to most potential users.
Unfortunately the Gyrophonic (Allen's alternative to Leslie Cabinets) boxes don't get any respect either. So unless you have an Allen organ player who wants one (or two or three) you get less than the value of the drivers when trying to sell the whole Gyrophonic cabinet. But the cabinets are solidly built and do make great work tables!
If you want to play with some very decent drivers (especially for bass), then that lot of speakers will probably be well worth whatever small price the auction gets. But if you are looking for a money maker, that lot probably isn't a good place to start. It will likely be too much effort for too little reward.
