That is a cool knife.

It is a Bulldog BKC 149-B and I think it is a second generation Bulldog with First Generation green bone scales.
There is a first Generation lockback same design BKC 149 that had a Bull Brand etch with stag handles that was released in 1981 with 188 knives.
Tony Foster's book compiled in August of 1990 makes no mention of BKC 149-A or BKC 149-B which makes me think that the A and B are Second Generation. Both the A and B were made with a quantity of 100 pieces.
The Bulldog Calf Roper first came out as a different lockback knife in 1993 when Jim Parker bought Bulldog. There is no documentation that I know of for BKC 149-A or B, both Calf Roper etches as being First Generation knives. I am relying on Tony Fosters work for this. I wonder if there is anything like this in Weidmannsheil knives?
Great collectable knife

Total Bulldog production is 388 knives for 3 models.