Please identify, Lago bike from Germany

The last image says

Moped-Fahrrad (Moped Bike) Mähmaschinen (Lawnmowers) OTTO D... (A name obv.) Reperatur...Werkstatt. (Repairshop prob.) Friedrichs.....en? (Riedrichshafen? Reflection in the way)

That would be a sticker from a repair / service shop for mopeds, bikes and lawnmowers

The second to last should be the brand, as there is another bike from "Liebigt" for sale here: http://www.dealmywheel.de/neue-gebrauchte-fahrraeder/muenchen/741027/frisch-restauriertes-sammlerstueck.php

I can find a few second-hand Liebigt frames on ebay and other German thrift sites, but I'm unable to find any wikipedia article or related information on that name, so other then confirming, that "Liebigt" is indeed the vendor, I can't provide any information on the model other then it should be from around the 1970s or earlier.

The logo on the headtube is hard to read, but it looks like it has the letters FLH, which is another sign of it being a bicycle coming from the company (F)ranz (L)iebigt, based in (H)aag. ( see similar logo in Flickr )

The factory was founded in Dessau in 1935 and it moved after the second world war from Dessau to Haag, therefore the bicycle cannot be older than 1945.

The factory produced bicycle with different brands (Ascona, Cortina, Elfa, FLH, Franz Liebigt, Lago, Nostra, Palma, Slalom, Sperber, according to info from this forum, which is accessible only after registration).

The factory was dissolved in 1992 (according to this site), so it cannot be newer than 1992 (well, not that you needed proof of that).