NOS Shure V15 type III cartridge opinions


I know this sounds crazy but going thru boxes stored in closet for the past 40 years and found one of these I had purchased in 78 as a spare and never used. My question is should I open it up and give it a spin on my vintage TT or keep it to replace my in use cartridge until it goes south or open it install to see what happens? Wished I had another headshell. I read this was the best mm cartridge build, great all around sound and unsurpassed tracking. 
Or put on market? I'm leaning toward trying it out but then again?
128x128gillatgh
Ralf it’s no penalty for trying existing one first
The way original needle sounds is unbeatable by any aftermarket .
In room conditions without usage it will stay just fine for century...
the suspension of most vintage needles is visible with pocket microscope for jeweler
Thank you dlcockrum for the link to jico. If need be I can order the vr35e or vr35 he directly from them at 79 or 119 dollars respectively. If I do need to order I will go with the HE hyper eliptical stylus.

FWIW, while surfing found a NOS the seller is saying is new in box for 499.00. Looks exactly like mine. Y'all go get it.
That would be my pick for a non-OEM and non-SAS option. Just keep in mind that it is not near the SAS in performance.

Dave
Ralf it’s no penalty for trying existing one first
The way original needle sounds is unbeatable by any aftermarket .
In room conditions without usage it will stay just fine for century...
the suspension of most vintage needles is visible with pocket microscope for jeweler
The needle will last forever, but the suspension on any Shure I've ever had never made it more than two years whether I used it or not.

If the cantilever appears to be fine, but won't hold the cartridge up when set up with the correct tracking force, this is a sign that the suspension has perished. OTOH, sometimes when it perishes it simply gets hard; at that point the cartridge sounds 'tinny'. Out of desperation when I had a cartridge do that, I put a tiny drop of brake fluid into the suspension area and let it sit with the cartridge pointed up for about a week. After that it played much better for about 6 months. Then it became really obvious that I simply had to replace the needle assembly.