Re: worn top question -- Regal tenor
If the top is shellac, you can clean it up easily with alcohool and a cut off paintbrush on the most dirty places and then fill the grooves with superglue or less permanent but more labourious with shellac layed on with a paintbrush; sand the lacquer down a few times, without sanding the wood(to keep that original vintage look)then you can apply whatever pick guard you want.
Shellac will subside a little over a month or two, so should be repeated if you want it totally smooth.
This one was dirty and had grooves like yours both sides of the soundhole.
Kentucky KM-805..........2 Hora M1086 Portuguese II(1 in car)
Hora M1088 Mandola.....
Richmond RMA-110..... .Noname Bearclaw
Pochette Franz Janisch...5 Pocket............Alfredo Privitera pocket
Puglisi Pocket 1908........Puglisi 1912.......Puglisi 1917
3 Mandolinetto ..............C.Garozzo
1 Mandriola...................Cannelo G. Mandriola...Böhm Waldzither 1921
Johs Møller 1945............Luigi Embergher Studio 1933
Marma Seashell back......Luigi Embergher 5bis 1909
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