At first glance, it looks like a Crescent wrench...but totally different...
It's like someone looked at a Vernier and said "Wow...That would be a good design for an adjustable wrench!"...
(If you think members of this forum are anal-retentive, you should meet an old German machinist...Back in 1969 I worked as a production machinist in an aerospace manufacturer...The machinist next to me was an old Americanized-German; ate a raw onion a day...One day I couldn't find a scrap to stir my coffee, so I pulled the 6" Starrett scale out of my pocket and stirred my coffee with that...You could hear him scream all over the plant...people came running...He was livid that I would so misuse my tools...After that, all us punk kids stirred our coffee with our scales...)