Nice gun. I have one that was made in 1950, +/-. Mine was my father's and it is used, though still in pretty decent shape and certainly shootable.
Mine has an unusual safety; a wedge of gold plated metal that is in the front of the trigger guard and is similar to the M-1 Garand safety in that you push it forward to put in "fire" mode. I was wondering if yours has the same type of safety being it is almost a contemporary. I think A5s were made with this safety for only a short period of time.
I can't really guess at the price but dfariswheel has probably given you a good idea.
I consider mine to be priceless, really; it was my father's and for that reason it has value to me that you just can't attach a dollar value to.
I trust you will enjoy and value your scattergun.