I have been searching the Internet for information as to when Heym introduced their modern double rifles, the 88, the 88B, the 88B Safari, and the 88B PH, the side lock versions of each, but I have had little success.... Does anyone know when Heym introduced each model, is there a list of s/n ranges for each model that identifies the year of manufacture?

I know that these guns are "modern" guns, but I would find it helpful to know if I'm looking at a gun made 30 years ago vs one made last year. Obviously condition is key when one assesses value on used rifles of this genre, but I would very much like to understand how old these modern sporting arms might be.

Does anyone know of any source for this type of information other than contacting Heym directly and providing serial numbers with a polite inquiry as to date of manufacture?