Parker 410 Question

[Brush Buster]

I have only ever been around a handful of 410 Parker's but all I have seen have been 3" ! Since so many years passed between the Introduction of the 410 Chambering and the 3" Shell you would assume the 3" is on the rare side and the 2 1/2 would be the most common although that doesn't seem to be the case ! As for value does the 2 1/2" Chambering add or deduct to the value of the gun and has anyone ever owned or seen a 2 1/2" chambered Parker 410 ,what is the opinion ? I always assumed the Parker 410's that were built on the OO Frame may have been 2 1/2 but maybe that isn't the case either ??