Courtesy of Donald Nannestad, here are two clips of Lincoln City action from the 1950s.

The Portsmouth v Lincoln City FA Cup 3rd round tie

https://www.britishpathe.com/video/f-a-cup-3rd-round-portsmouth-vs-lincoln-city/query/lincoln+city+football

And from 1958 a royal visit.

https://www.britishpathe.com/video/royal-visit-to-lincoln-scunthorpe-grimsby/query/lincoln+city+fo