London Bus And Family..

Hungary
The first scheduled bus service, Budapest - 1915
April 16, 2015
The stamp design features the first two Budapest buses. One is a battery-powered, double-decker Austro-Daimler, and the other a single-decker with a petrol engine made in the Engineering and Rail Rolling Stock Works in Kistarcsa in Hungary.

And for good measure, here's a bus from Canada, wh[ch is now my home. (Canada, that is, not the bus.)

Iceland
The Automobile Age 1913-2013
March 14, 2013
Set of four, one stamp shows a Mercedes Benz bus (1957).

Berlin (Germany)
Transportation
April 30, 1973
The stamp set features horsebus (1907), trolleybus (1933), deck seat bus (1919), doubledeck bus (1970), doubledeck bus (1925), and standard bus (1973).

Malta
Mechanized Transport
September 26, 1996
2c: "Diamond Star" (1920s)
5c: Stewart Bus no. 434 "Tom Mix" (1930s)
14c: Bus no. 1764 "Verdala" (1940s)
30c: Bus no. 3495 (1960s)

Ireland
Irish Buses
October 12, 1993
The stamp set features GNR Gardner, CIE Leyland Titan, Horse Drawn Omnibus, and Char-a-banc.

This nicely detailed advertising label of the Metzeler Rubber Co. (Germany) shows an ancient electric bus, or tram using its "massivreifen" tires. Sorry I can't identify the maker or model of this vehicle. My internet search turned up no electric bus, or tram which even remotely resembles this one.

Metzeler was founded in Munich in 1862. It is now a subsidiary of Pirelli, of Italy.

Moldova
Urban Transportation
October 12, 2013
The stamp set shows a bus and a trolley bus.

France
Commercial Vehicles
October 27, 2003
Set of ten, two stamps show buses.

Portugal
Urban Transport in the 1970's and 1980's
March 8, 2010
Set of five, two stamps show a double-articulated bus and an electric articulated bus.

Portugal
Urban Transport between 1947 and 1974
February 9, 2009
Set of five, two stamps depict Bus No. 2 (Barreiro, 1957) and Bus No. 207 (Porto, 1960).

Ukraine
Transportation
November 6, 2015
The stamp set shows Trolleybus Kyiv-4 (1963) and LAZ 695 Bus (1961).

Singapore 2017 Morning bus.

Universal Mail United Kingdom (UMUK) has been a private mail courier in the U.K. since 2006. They deal mainly with the tourist trade as well as museums and other sites which attract visitors. According to user comments on other web sites, this service is a little slower, but equally as effective as the regular postal service.

The label shown below is valid for international postcards. It depicts a Double-decker London bus as shown on the original posting of this thread.. According to the stamp listings on the Universal Mail website, it is still available for purchase.

KuoLC5310,

Here are the other two to match yours: