Welcome to Beoworld
A very sad but not uncommon end to wall mounted Beomaster 3/4500.
The best you can hope for is someone selling a non-functional Beomaster3/4500 on Marktplaats (with a non broken glass) and then using it for its glass panel. Always remove all of the old failed tape with Brand Spirtus (methelated spirits) and re-glue with a small amount of silicon bath sealer.
Regards
Richard
Some of my B&O: BV3/32, MX7000, MX5500, LX5500, MX4000, BM8000, BM6000, Overture, BL8000, BM6000 Quad, BM4400, BM3400, BG-CDX, BM3000, BM1001, BM1200, BM1600, BM1700, BM1500, BM1400, BM2400, BM2300, BM4500, BM4000, BVM70, BVS45-2, BVS60, BC7700, BM2200, BM1900, BG8002, BM1202, BVPenta, BVP45