There is a small gold – colored metal tag, 14x34mm, riveted to the top of the filter mounting bracket. I have seen different patterns of these tags; this is a perfect duplicate of one. F.I.S.P.A Fuel Filter Housing Tag
While the 250 series race cars were well-known for the beautiful six two-barrel Wber carburetors the normal “street” cars used “only” three two-barrel carburetors and the large “three-in-one” air cleaner assemblies still supplied by F.I.S.P.A. These had satin black-painted tops and bottoms with nickel-plated perforated steel side panels. The “inside plug” engines and the outside plug engines used this tag and a few other details until the GTE production began. They had the two-ear wing nuts on the air cleaner tops, silver-painted timing chain covers and these metal air cleaner tags. I have seen these three details on cars as late as #2039 and I think that the change to the F.I.S.P.A decals, black wrinkle timing chain covers and three-ear wing nuts was made about that time. “inside plug” air cleaner tag with 70mm rivet spacing.
The third type of air cleaners was the more conventional “Coffee Can” model. They used a satin black painted steel top and bottom with side panels made of louvered aluminum or perforated and nickel-plated steel. The earliest ones had the Weber information embossed in the top but this was soon replaced with a smooth top using the same Weber tag riveted to the top. Early “Coffee Can” top Weber tag.