Hello, I've tried a few searches so I apologize in advance if this has been discussed before.
I have an old Seiko watch from my grandfather serial number is 6139 6005 and I would really like to switch the stainless steel band for a red and blue NATO strap. I already have another nice stainless watch i wear frequently and feel this strap looks so good with the dial and bezel. However I am unsure if I can do this myself. To me it appears as though I'd have to bend the metal to get the current strap off. I of course do not want to damage the current wristband so I can change it back at a whim. I am wondering if this is something I can do on my own or if I will need to take it in. As this watch is probably pretty old (no idea how old maybe 1970s???), there are no PDFs of a manual I can find online.
Here are some photos of the watch and of the underside where the wristband connects to the case.
Thanks in advance for any help!