Case that will fit my movement?

Hello all,
I haven’t been on the forum that long, but I am hoping someone can help me with this. I have been piecing together a vintage 284 Railmaster for a while now and I am getting close to completing the puzzle. I need a case for it, but I am coming up short. I saw a case pop up on eBay the other day with a serial number on the case back of 14924. I am wondering if anyone knows if it will fit my movement. I would really like to start enjoying this piece on my wrist.

Thanks!

Hello and welcome!

Would you be so kind and share some pictures of what you have there right now?

I added some pics of my movement and the case that is for sale. Wondering if it will work?