The reason I am doubtful on the certificate is RSC no longer issue it long ago and this dated just 2 months ago ( Obvoiusly my AD hasn't really tried hard enough ) One word for caution to anyone interested buying vintage rollies, dial swapping is very rampant as told by Ubiquitous and for that you could pay hefty price for DRSD, for an example of which there's no proper record on such dial except the s/n run( I can't recall now). Even the expert from RSc can't confirm that as well