You can find 52T chrome chainrings to fit...they are often labeled as Nervar, but don't usually have any logos/branding on them. The 52T typically have the three-lobed configuration like your current chainring, but have a series of oval holes outside of that to move the teeth out to 52T. There are some Magistroni versions that go up to 51T without the oval holes...not common, and the one I have I am not parting with
. TA makes the full range of 116BCD alloy chainrings, but they have an inner circumferential ring at the bolt holes, so they look completely different.
Here is a 52-47 combo for a decent price on eBay (not mine
https://www.ebay.com/itm/NOS-Nervar...=item46894a5267:g:gjUAAOSw0rBbzN~x:rk:19:pf:0
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