Tubes Asylum

Valvo 5r4GY or not

96.227.67.90

Rouvin

Do these Valvo 5r4GY look authentic? Notice the Hamburg wrapper on the left side of the pix. Valvo or someone else's manufacture?
I've not been able to find any references to this specific tube.
Opinions?
https://www.ebay.com/itm/5R4GY-Valvo-nos-Vintage60-double-mica-support-electron-tube-x-1-piece/274285729321?hash=item3fdcb41629:g:hwsAAOSwU0Vd-vZ-

Thanks,
Rouvin

Follow Ups:

RE: Valvo 5r4GY or not - FlaCharlie 08:16:14 05/24/20 (0)
Are these considered rare / collectible or much higher quality than other brands of this type?

Just wondering since they're listed for $71 each and the major dealers list 5R4GY for $15. What makes these worth almost 5x more $$?
RE: Valvo 5r4GY or not - tubemaze 11:57:21 05/22/20 (1)
Look legit, but not Valvo. Date code states Marconi, which IMHO is better.
- RE: Valvo 5r4GY or not - XLR8OR 04:14:11 05/24/20 (0)
  +1

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