No offence intended - it's not just an insert, it's had lume added. That's not to suggest it's no longer a "genuine Seiko," as you assert I suggest, just not - for me - a factory issue anymore.
This thread is getting silly. So now patching a hole in the original lume detracts value. What are you on?
If price is not an issue to you that's great... I look forward to seeing your high value all original untouched collection. Please post detailed photographs.