Looking for help IDing mechanical siren/light combo to replace a lense

I'm hoping to get some help finding a replacement lense for this light/siren. It's mounted on our vintage chiefs vehicle we use for parades and such. I didn't want to climb onto the vehicle, so I got the best shot of the ID plate that I could. What I can make out reads "Champion Siren" and a listing for Darley. Any help is appreciated. If needed, next time I'm at the fire hall I will get a ladder and try to get some detailed shots of the label or at least try and see if the model and stuff can be made out. Thanks!

 

[stansdds]

WS Darley Champion. Darley was a fire apparatus manufacturer and they used Federal Signal lights and sirens that had Darley ID tags. As far as I know, Darley did use the Federal Signal model and serial numbering system.

 

[Maxim2Eng]

@stansdds is right, but finding a glass replacement may be quite the hunt. It looks like a FS 66LR (based on the 28 with a polished housing with a flashing light to the front and rear).

 

[shues]

What is the diameter of the lens?

 

[Maxim2Eng]

6”
If you can’t locate a lens, you might consider making a plastic lens from the original. Here’s a link on how to:

How To Make a Replacement Car Lens Using Crystal Clear 202

How you can replicate a tail light lens of any car using optically-clear resin.

www.smooth-on.com