Yours is D/D# I take it? They must be very rare. I would think the C#/D version is also rare.
B/C ones seem to be reasonably common.
It is D/D#, and sounds absolutely glorious in original factory tuning - but it was in B/C when I got it, as the vast majority of these seem to be (though Donie Nolan has a C/C# one that he's very fond of). Indeed many of them seem to have been bought for marching bands when they were new, and bear the scars of having had music lyres attached to them, as well as the general abuse that band instruments are prone to...
The D/D# reeds came out of this very clean and hardly-played 1956 model that I got a few years ago:
And the neatly-performed operation seems to have benefitted both boxes, which both sound even better in their new keys - so much so that the (now) B/C got very quickly bought off me by a well-known North Kerry box player...
What are the pallets in your one made of? Wood or plastic material?
Here it is "with the hood off". See for yourself: