A very old lens that is 18" across was purchased from an old engineers collection i'm assuming it's front locomotive lens 
VTG Blue Valley Federal Savings And Loan Association 18 inch Metal Ruler W Pics
HORNBY LNER CLASS B12 THE FLYER POINT OF SALE SALES POSTER 20" X 18" INCH (B341)
Dalek 18 inch interactive original Gold spheres x2
Vintage Metal DR 18 201 Steam Locomotive Model Green Streamlined Display Train
MS109 LILIPUT H0 18 03 - STEAM LOCOMOTIVE BR 18 451 DB - ANALOG
Hornby Dublo OO Gauge 1/2" Half Inch Spare Locomotive Motor Runs Well - Lot 2
