8" woofer with inverted surround ID

Is there any way to identify this woofer without removing it? It's 8" with an inverted surround. It's in a cabinet that is 18" H x 10" W x 8" D (457mm H x 255mm W x 204mm D) that is probably a DIY build as there's no branding or stickers. Many thanks!
s-l1600.jpg
 
I now think they're Audiomasters, but the tweeter is different from MLS1s and the cabinet is different from MLS2s... Could they have changed the design of either model slightly during the production run?
 
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