John, it would be interesting to discover which NOS TR2 grille you have.
TR2's had three different grilles. There was a chrome finish diecast Mazak grille p/n 800534, which was at some stage was substitued for a polished aluminium casting under the same part number. The third type was a polished sheet metal pressing p/n 554813.
The reasons for these various changes seem to have been lost in time.
There are a number of early TR2's under rebuild at present (a friend has started on TS166), whose owners might pay good money for a NOS item. I suppose an ebay listing is one way of finding out what the market thinks it's worth.
Regards,
Viv.