Thank you for contacting Mearto with your appraisal inquiry.

It is a beautiful handbag. Such vintage designer accessories are being offered at auction on a regular basis. The design, materials used and the way the handbag is made shows that it is an expensive handbag from a luxury brand. It appears to be in very good condition with only minor signs of wear and use. And the fact that you still have the original paper and dustbag adds to the value.
Today Rendl handbags are sought after by both collectors and dealers however the style is slightly old fashioned which naturally affects the price. But then the materials used are not something that is possible to use for handbags today so there are two sides to it.

I believe that your lovely Rendl handbag with rhinestone lock would attract the attention of both collectors and dealers if it came up for auction.
The estimate provided is for a well-advertised specialised online designer accessories auction, where I believe the handbag has the best chance of realising its fullest potential. However, there is no measurement for the sentimental value you might attach to your grandmothers handbag. Retail "asking prices" can be higher and vary.

Please let me know if you have any additional questions. I’m happy to help.
Thank you