These Vintage Payphone Temporarily Out of Service Signs KS7991, NS7991 from The Bell Telephone Company of Canada. W.L.P. Co from Bell System are crafted from metal and are designed for use on coin collectors that are either not ready for service or temporarily out of service. Measuring 5″ x 3″ and featuring a 1/2″ mounting slot, these signs are intended to be mounted over the 3-coin slot located on the top of the payphone.