i retract the statement about the cinch back. the ebay picture shows them. oh and also that pair only has one back pocket, typical from that era.

it seems somewhat legit. it has the buttons for suspenders, no belt loops (those didnt come till a few decades later), from what you can see there are studs for buttons on the back waist also which means it predates the cinch back, the left leg shows some twisting (which usually happened to earlier makes of levis), one of the earliest surviving pair of 501s are from 1901 and this is found in cali nonetheless. they actually did have sizes back then but fit smaller by todays standards. eg a pair of 501s from 1947 that are w32 l34 would translate to a w30 l33 today (i have a pair of deadstock repo 1947s). referring to the coin pocket, its not actually a coin pocket but a watch pocket. having that said it's either these are very very good repos from that time period or its the real deal.
levis is actually know for buying back vintage capital E era jeans so they can display them in their museum.
i used to work for levis, that's how i know all this needless info. it does seem legit