Yes , I still have some of those keys kicking around , don't think there are many call boxes left nowadays though.
I also have a metal RAC badge which was passed down from my dad on the Ponton , along with the metal RAC 'GB' plate on the bootlid , and a 1955 members' handbook in the glovebox .
I was a member for a couple of years lately , by virtue of being insured with RAC but apart from that have never bothered with breakdown services - my train of thought being that Mercedes cars are very reliable and what I save in annual subscriptions more than covers the cost of paying for the odd recovery ( in fact , I have only once needed recovery in 30 odd years of Mercedes motoring following diff failure on a W124 , which cost me £75 to get the car brought home ) . How much would I have spent on membership over all these years ?
I remember being canvassed outside a supermarket years ago by a guy selling AA memberships , and leaving him speechless by replying ' I don't need it , I have a Mercedes-Benz ' , then a couple of minutes later giving him a toot and a wave as I passed in the Ponton .
I did get a couple of years free AA membership back in 1976 when I bought a new Austin All-aggro : I certainly used it a few times with the frequent breakdowns until I got rid of it after only six months .