Legit Check - 50th Anniversary Constellation

Hello all,

I purchased this 50th Anni Constellation (ref 1304.35) through government auction and seen some questionable details.
Pictures attached.

1. The crown is missing the Omega logo
- Could be aftermarket replacement, or could this be an Omega service crown?

2. The left side case 'guards' seems to be yellow gold, when the whole watch is rose gold.
- Could also be an aftermarket replacement.

3. The date wheel box seems to also be in yellow gold, while other indices are in rose gold.

I haven't had the chance to take the watch to a watchmaker yet, but that will be done next week.

TIA!

Photos:

No idea. Have you compared it to other photos? Only choice is take to to a watchmaker or omega.

That rose gold looks more like bronze, but I am no expert and other 1304.35 look like this so it might be genuine.