From a 1950 Express Catalog:
View attachment 1913641
View attachment 1913636
Your bike might be a Express Modell T (HB is same specs as T, but 26" wheels)
Mens Bicycle: Frame made of best precission steel tubing, outside soldering, lugged, "Double-Bell-Type" bottom bracket , screwed on chain wheel 1/2 x 1/8 with rolled-on edge for chain support, front fork with oval blades, wheel set 28" with best quality front hub and Torpedo free coaster brake, 1st class chain and pedals, Elastic-saddle with rebound and comression spring, bag with tools, Express-handlebar, detachable, with pivot brake, bell, rear reflector, fender mascot, enamelled deep black high gloss, with double lining.
Extras, per demand : Strahlenkopf (="StreakHead"), rims and mudguards with center lining, Express-green or wine-red with streak head, all blank parts chromed
So you seem to have the red-vine color with the Strahlenkopf-Extra (the black shades where actually made with the sooth of a burning wax candle).
The only thing which deviates from the description: your photo does not show the famous detachable "Express Lenker" , which many Wehrmachtsräder had.
As Andrew Gorman already mentioned:
The Glockelager "Double-Bell-Type bottom bracket bearing assembly" is indeed not easy to service.
In case you need to re-adjust the play of the main bearing or simply clean out old grease or other grim, you will need to separate the pedal arm from the main shaft. The screws on the outside only serve as a check-nut (left side, left thread, right side, right thread), so the arms don't disengage over time when pedalling.
The shaft has four flats (sometimes three, or other shapes), and the flats are tapered, the eye on the pedal arm has the negative shape, als tapered. During assembly, they are pressed in and make a very tight fit. Now the hard part is disasembling the arm from the shaft without causing a wreck. Do not use a sledge ham,mer or other drastic and unnecessary methods. With a small effort, you can built a pull-off device - the most important thing is to have a support against the frame - otherwiese you might just bend the pedal arm. I have dissamsemmbled many Glockenlager and never had an issue with this method, just make sure to lif t the arm as a whole (turn in both screws) so you dont tilt the arm on the shaft, preventing him from coming loose. Actually, some times you get a loud CLONG and the whole arm including the fixture will jump up a few inches when the fitting comes disengaged - there is quite some power involved.
View attachment 1913646
One very cool thing about your bike:
The original safety caps (usually made of brass) for the Dunlop valve are still there - they always get lost

If the tube is in too bad shape to be badged, I'd order a dunlop valve replacement tube online, preferibly the short stem version - modern valve stems are much longer and stick out too far.
And check the rear hub: There must be a stamp below the F&S eagle telling you the year of built. I have acees to more Express-literature.
Yes, it is not a super valueable bike, but a very original one - even with og. Express bell, pls. be patient when peeling of the tape