Vintage Cast Spring Loaded Safety Latch and 48 similar items

This is a really unique, cast iron of some sort, security latch. I am unsure what it was used for or even how it was used , however the top lever can be moved up and down ( with a spring load). When up it exposes whatever the latch covers, but still with limited access. When down, it can have a lock inserted to secure the latch in the down position. Only thing that I see is a marking that reads PATT APPD FOR. THis appers to be super duty lock, probably securred with a couple strong bolts on the bottom. Looks very specialized. Measures approx 4.5" at the widest, by 1.75" and is approx. 1.75" deep. Screw holes are 2.75" center to center hole. If you have a idea what it is, please let me know, because I am clueless. Thanks in advance. I take pride in my pictures, and are a valuable extension of my description. Please take time to see the product fully. Buy with confidence! Check out my other auctions by clicking here! All items are packaged with great care and shipped next day, excluding any weekends and holidays. I will combine shipping whenever possible as long as the products can be safely packed together. Please be aware, if you have a PO Box, you may receive an additional invoice to cover any additional shipping costs. Please remember to leave feedback, it helps to keep good sellers . International Buyers: We do not mark merchandise as a gift or below value due to it being against US and International Regulations . All custom fees and duties are the responsibility of the buyer. Seller is not responsible for any package held by Customs. Returns are accepted. Must be returned in the same condition as received and in same or similar packaging.