adrianholovaty
commented
1 year ago Just chiming in to say I agree this is worth considering. I've also run across this variant in my own work.
An example is from the "St Louis: Kunkel Brothers, 1878" engraving of Franz Liszt's Hungarian Rhapsody No. 2, available via this IMSLP page. Here's a screenshot from page number 3 (page 5 of the PDF):
In a print by Simon Richault I found this peculiar variant of a double sharp:
Source: Sayve, Auguste de: Duo, Paris [1830]
Maybe worth adding as an alternate?