Without the pips that would be a Hilfsarzt - certainly going by the the 1943 OB anyway (pic attached). Have you seen this two pip/Litze configuration shown as Hilfsarzt in a book?
Strap looks like a good one. Garry is correct about the pips being wrong. Also the button should not be numbered. So it's a good strap that has had a little embellishing IMO. I would have bought it, they are hard to find.