I'm almost certain that's a Coach/Cashin bag, BUT I would be hesitant to sell it as such. With no Coach markings it would be impossible to prove. I wonder if at one time your bag had the little metal Coach label and it fell off?
The "B" on the hinge is for Branson Manufacturing who made the hinges, so that's no help at all...unless they only made hinges for Coach.
I found 3 of those bags on ebay. They all appear to be identical to yours and the first one DOES have the small "Coach" stamp. The other 2 don't appear to have any Coach marks at all, but one was sold as Coach and the other was sold as Cashin.
http://cgi.ebay.com/Vintage-Bonnie-...emQQptZUS_CSA_WH_Handbags?hash=item53ddb83730
http://cgi.ebay.com/VTG-COACH-BONNI...emQQptZUS_CSA_WH_Handbags?hash=item2557043e0b
http://cgi.ebay.com/VTG-BONNIE-CASH...emQQptZUS_CSA_WH_Handbags?hash=item4a9c6b85a7

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