Steven: I noticed that very thing for the first time, looking through old Beeman catalogs recently. I don't know the story behind it! Maybe some kind of goof in the catalog photos? Or maybe Beeman actually sold the L stock as his standard model for a period.
Beeman did occasionally change guns from their factory state. An ex-employee told me, for example, that they bought some extra Tyrolean stocks and "created" new T's in their shop, so maybe something similar happened with a batch of L stocks. At any rate they are lovely guns and do seem to turn up fairly often.
In other words...my impression is that the long stippled stock was never the factory standard for the basic Match model...but I could be wrong.
1BadDart: Thanks - great pics and an interesting comparison! I would point out that your Match stock is a first-generation one. The later version was even closer to the L stock in general shape, especially noticeable in the forward "sweep" at the top front of the cheekpiece.