Wow thats really lucky. Strange seal melt affected crystal and not dial!

All rubber deteriorates over time. Its quicker if temperature ans humidity is high. Also find that if it is sitting untouched or moved for long time it also accelerates it. I had a beand new hiking boot from salomon that had the uppers completely separate from the rubber sole when i lifted it after just 3 years sitting in a shoe cabinet. Other rubber soled shoes that were older and used regularly were fine. I had forgotten all about the hiking boot as it was tucked away in a corner. That was when i was living in a tropical climate.

I have tole myself that every 1-2 years i will open my monacos to check the seals and give them some treatment to prolong life. Same as how i used to preserve my rubber diving equipment before they had silicone ones

: I'm pretty lucky when it came to my 1133, as the seal had
: thoroughly melted, but it never affected the dial. Thank god.
: The seller I bought it from opened it to take photos, and got
: seal splattered on the dial, but I guess he cleaned it off
: before it got to me. When it came, only the crystal had any
: damage to it. (Seal had somehow gotten on the crystal, and had
: done some small damage.)

: My 1533 seems to have been damaged by a seal at some point, but
: survived remarkably well for a metallic type dial.

: Also, I quite fancy those 1133G's... :P