G�©rard Henrotin, in his "Luger Producers" E-book has a short chapter on Spandau Lugers. This graphic detail below has been screen cropped from one of his excellent illustration example of a Spandau toggle link.
Let me quote a couple of G�©rard's paragraphs from his chapter on the subject:
"During the sixties, some American Luger collectors mentioned the existence of Lugers whose toggle was struck with a Spandau crowned logo. That raised a controversy between European and US collectors on the authenticity of these pistols.
These pieces, however, are very scarce. The so-called "production" is estimated at about 200 pistols. The lowest serial number reported being "12" with a 1917 chamber date, and the highest number being "177" with a chamber date of 1918. The extremely low quantity might lead one to reject the assertion that they are true Spandau products. All the experts who had an opportunity to closely examine these pistols, mentioned the presence of typical ERFURT parts."
I highly recommend this e-book as good Luger reading and the illustrations are 1st class!
regards,
John
http://boards.rennlist.com/upload/Spand01crop.jpg