Steven, What's the little do hickey sticking off the side of the head? Jay Sexton Sebastopol, CA
There are many details that make this the first version: a) it says Brev°. instead of Brev. on the main pump head body b) it has the writing on the lock ring that is written in the larger font size than the later versions. c) The word Patent on the lock ring is written with the top of the letters near the center instead of on the outer side.
If your pump head has all of these elements, you could do far worse than to sell it to the second bidder
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Steven Maasland
Moorestown, NJ