Many thanks for your comments gentlemen. A fellow collector pointed out that the Garde wappen is a reservist as it has no bandeau on it and I had missed that entirely. Ideally, there should have been a small (in this case very small) reservist silver cross fastened to the bird. There is no evidence that there ever was one. This came off a size 53 cm off. helme that had been sent to me for some TLC but could not be saved. It is very hard to believe, that anyone with that small a head could be a Garde officer even Reservist.
I do feel very lucky to have purchased the PB 10.