Royal Medical Army Corps Collar Question

[dubaiguy]

I'm trying to put together a small collection of Royal Army Medical Corps cap and collar badges (because a/ I like the design, b/ they are relatively inexpensive & c/ readily available). I admit though that apart from getting the odd jag a lifetime ago, I really know nothing about the corps and my interest is purely on collecting the badge.

I have shown some examples in the first scan. The collars are slightly smaller than the cap being approx 34mm versus 42mm in length.

So my dilemma is what are the two badges at the bottom of the second scan? I think I have two absolutely matching OSD collars. But they are 42mm and thus the same size as the caps shown on the top line.

Do I have two matching collars or two caps badges.

Any direction would be appreciated.

Mark