По этой ссылке про такой слаб ничего нет. Вот тут посмотрите: "PCGS 4.5 Regency Slab - Conder101's description: "This slab really belongs between #'s 4 and 5 but this is where you're going to get it. This was the Regency Slab, a special premium slab that was intended to allow the collector to recognize "special" coins. Either to showcase very rare pieces, special pedigree coins or even special events. The Regency slab is a large slab, five inches high and three across at the widest point. They cost $50 ($30 slabbing fee plus $20 for the special holder and personalized inscription) and you were allowed to specify a two line inscription to appear on the front label. (Maximm 44 characters.) According to Rick Montgomery these were produced from 1992 to 1995 but so far I've only been able to trace them from Mid 1994 to the first quarter of 1995".
Boiler78 recalls seeing the Eliasberg 1827 dime in a Regency holder, confirmed at HA archives that describes it being in a "Delux PCGS Holder". Since it was sold in the Eliasberg sale 5/96, this slab must have been produced at least up until May or June 1996. If you have documentation of the start and ending dates, please let me know. The Danny Kaye Lirot is by far the most commonly found Regency slab. If you search "Regency" in the US Coin forum, "astrorat" maintains a current census.
Personal perspective - this is a specialty slab akin to the multi coin holders and not really a generational slab. To me, a "generation" is a design that you would receive back on a routine submission, week in and out. The 4.5 is more like the multi-coin holders and other "by request" slabs. That being said, it's cool and very collectible especially for those trying to put together a collectible holder type set".
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