These rifles went through a few internal changes during their production.
For two years, 1933-1934, the Model B was #### on opening and some didn't have cocking pieces on the end of the bolt.
Mine has the arrow, but no "safe" position is possible because there is no cocking piece.
I was recently given this rifle. Somewhere along the way someone went through a lot of time and trouble to attempt to convert it to a rear tube feeder. That's quite an undertaking for a single shot. Doable but lots of tedious, finicky machining and fitting. They also set it up in a very heavy dense wood, maybe Teak, with a full length profile, drilled for the rear tube assembly, which was never installed. Rifle weighs just over 12 pounds. The smith used 1928 Thompson SMG sling swivels on it.
I wasn't going to do anything with it at first glance, just use it for spare parts. However the darn thing shoots CCI standard velocity ammo like it was made specifically for it. Half inch groups at 50 yards, on bags, on the bench of course.
So, I'm working on getting up the energy to finish the conversion, but with an inline magazine instead of a tube.
OP, that rifle will likely shoot very well.
I believe the arrow on the bolt body is for rifles with cocking pieces and the #### on closing feature, which most of them were. I believe it's there to indicate the half #### position, safety.