Sure, send it along. I'm planning to add a chapter on early pressed glass salts to my Manchester book in the Appendix, a mix of Manchester salts, selections from 150 examples I picked up at auction, many of which we went through with a top expert in US salts.
The purpose was to see if there was much overlap between salt patterns in the USA / UK / Europe. The general pattern is that up to c1850, there is a lot of overlap across the continents, although in the UK, lacy salts were never made, as far as we can tell. So your speculative MW 307, dating to c1850s, is likely to appear in the catalogues of other companies of this date... if only they had survived.