Here's something I've had lying about half-finished for a very long time, but which I was reminded of earlier today: a map of the last Norwegian election under FPTP, in 1918.
The Norwegian single-member election system was a bit eccentric, however: originally, most members were elected through an indirect system involving each parish sending representatives to a constituency electoral meeting, which in turn decided on a representative to send to the Storting in Christiania (as Oslo was still known). This system was gradually abolished over the course of the 19th century, replaced by a two-round direct election system, under which the voters would vote directly for their representative, who would win election if given a majority of votes - otherwise a rematch would be held under straight FPTP, and the candidate with most votes in this would be declared elected.
Constituencies were defined as either rural (
landdistrikter) or urban (
bykretser), and by law, rural districts had to be overrepresented to a certain degree. This meant a large advantage for the Liberal Party (
Venstre), whose support base was mainly rural, whereas the Conservatives (
Høyre) languished in eternal opposition. The Labour Party (
Arbeiderpartiet) were on the up-and-up during this period, like their counterparts across Europe, and in the 1918 election they received the largest voteshare of any party at 31.6% - however, partly due to their support base being underrepresented and partly due to "anti-socialist alliances" formed by the main two parties in the second round of the election, they ended up with only 18 of the 126 seats. Meanwhile, Venstre obtained 28.3% of votes and 52 seats, and Høyre received 30.4% of votes and 39 seats. Frisinnede Venstre, a Venstre splinter consisting of evangelicals and urban businessmen, formed an electoral pact with Høyre in this election, and obtained ten seats. The party system was rounded out by the Peasants' Alliance (
Norges Bondelag), a predecessor to the modern Centre Party, who received 4.7% and three seats, and the Workers' Democrats (
Arbeiderdemokratene), a weird "non-socialist workers' party" consisting of Georgists and similar "this could only have been a thing at the turn of the century" groups, who stood candidates mainly in Oppland, winning three of the five rural seats in that county on 3.3% of the national vote.
This election saw no party or bloc come close to a majority of seats, and with the realisation that the party system was broken came a desire for constitutional reform. The next election, held in 1921, featured a proportional election system for the first time in Norwegian history.