I agree with everything that's been said about Bulldog, though I'm not an expert.
However, would that necessarily apply to Shapliegh's? I know that like Bulldog they are made for Parkers, but my two Shapleigh's cattle knives are very nice with strong springs, good fit and finish, and good carbon steel blades. Another example of a Parker's line made by Olbertz with a spurious backstory is Weidmannsheil. However, again I find them to be well made and all around good knives. Better than my experience with recent Bulldog anyway.
It seems to me there is a hierarchy of Olbertz manufactured knife lines which I would rank thusly, in descending order of quality:
Fightn Rooster
Shapliegh's/Weidmannsheil
German Eye/Indian Head
Bulldog
I also don't know what they are currently producing, and what may be "new old stock".
I'd be very interest in Charlie's and Hukk's views on this, as I know you both to be very knowlegable.
Regards,
Jim
What I can think of, some NOS found in a warehouse
Standard - looks like a Bulldog Warncliffe, it should, made in Germany at Freidrich Olbertz

Parker Trust owned the trademark at one time
Simmons - Hornet
All of these below were made in Germany at Freidrich Olbertz, from what I understand. They found some trademark blades with parts somewhere.
Marshall-Wells Zenith model in 3 different celluloids
Krusius Brothers Gazelle model in 2 different celluloids
Marshall-Wells Cactus model in 2 different celluloids
Krusius Brothers Govenor in 2 different celluloids
I don't know if Parker's Trust owned any of the trademarks, I guess they did since they made the knives.
I would rate them as follows:
Fightn Rooster & 1st and Second Generation Bulldogs when Charlie Dorton was in charge.
Shapliegh's/Weidmannsheil
Third Generation Bulldogs &
25th Anniversary Prototype Bulldogs (2004)
German Eye/Indian Head
4th generation Bulldogs
5th generation Bulldogs 2004 to 2000
5th Generation Bulldogs 2005 to current crop.
As you can see, I rated each generation of Bulldog seperately because there is a discernable difference in quality, sometimes quality falling off within the generation. As of now, I would not buy a 2006 or 2007 Bulldog. I did buy some 2006 Barlows and 2006 Swing Guards. The barlow was OK, the swing guard, well, not anything to recommend in my opinion. Seems like quality keeps going downhill, which you can see by how I rated each generation.