Marlin Firearms Collectors Association

Hello. Can anyone tell me what makes some of the Beretta 9MM pistols "Brigadiers'? I've seen this listed for some of the different models but I dont know what makes them different.

Thanks so much for the prompt reply.

Hello. I'm trying to determine the year of manufacture for a Smith & Wesson Model 36 that I just bought. It's a straight Model 36, no dash, regular latch (not flat) and serial nunber starts J198. Thank you very much, Tom