Let's call them second-gen, even though it could be argued that the final-gen (AT3472 family) that we know so well is essentially only a simplification of the AT200 family. The styli don't interchange, but the specs are virtually identical-- the AT216EP and AT221EP being notable-though-minor exceptions-- so the important bits are very likely the same. There is a small inductance difference (450 vs 650mH) to be considered too. But they show up in the US market so infrequently that they can be easy (for me, at least) to overlook.
UPDATE:
They first show up in Audio's annual directory in Oct 1984, presumably for the 1985 model year, priced from $25 to $65. They last appeared in the 1987 directory.
They were based on a series of standard-mount cartridges that never came to the US (farz I know). Examples would be the AT-E30 and AT-261:
as well as the whimsical AT-E32 (p-mount on left, standard on right): 
But this line of E models extended into some very snazzy, related-but-incompatible cartridges, like this AT-E50:
Worth looking up. Beautifully made miniatures, jewel-like, though actually finding one in the US... very difficult.
I categorize the second-gen p-mounts as the A-T equivalent of ADC's equally short-lived Integra XTs-- nearly nonexistent, just barely real, but of a quality we haven't seen for a long time. I now have a couple of these, including the AT231LP. No better than, say, an 8008, but good and well worth having.
UPDATE:
They first show up in Audio's annual directory in Oct 1984, presumably for the 1985 model year, priced from $25 to $65. They last appeared in the 1987 directory.
They were based on a series of standard-mount cartridges that never came to the US (farz I know). Examples would be the AT-E30 and AT-261:
as well as the whimsical AT-E32 (p-mount on left, standard on right): But this line of E models extended into some very snazzy, related-but-incompatible cartridges, like this AT-E50:
Worth looking up. Beautifully made miniatures, jewel-like, though actually finding one in the US... very difficult.
I categorize the second-gen p-mounts as the A-T equivalent of ADC's equally short-lived Integra XTs-- nearly nonexistent, just barely real, but of a quality we haven't seen for a long time. I now have a couple of these, including the AT231LP. No better than, say, an 8008, but good and well worth having.
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