I bought a new wrench! Found it via eBay. Vintage, hand-made, from the 1920s or so. I cleaned out the old grease and grime and oiled it up with some WD-40. Took me a while to figure out how to get the ratcheting mechanism to work correctly, but now it slides up and down like a charm! See below for the details:
H & E Wrench "HandE" 10 Inch Slide-Adjusting Nut Wrench
(Information from Alloy-Artifacts.org website)
H & E "HandE" 10 inch slide-adjusting nut wrench, stamped "HandE Wrench Co." and "New Bedford, Mass." on the fixed jaw, with a "Pat'd Sept. 20, 1921" patent date at the top (see middle inset).
The overall length is 10.3 inches, and the finish is plain steel.
The patent date refers to patent #1,391,179, filed by Evans and Hemphill in 1920 and issued on that date.
[Personally, I find that the logo might also be pronounced "Handy Handle" (HandE HandLE), since the "L" character on the end looks like the letter "L" and the letter "E" combined.]