The inscription 'Masterpiece' identifies it as an export model that was not intended for the German market. Based on the feed, it can be classified as the second variant of the then 149. The value depends decisively on the condition of the ink window: light, yellowish celluloid points to little use and thereby higher value; dark discolourations reduce it significantly. Before a sale, the fountain pen should be thoroughly flushed. For value orientation, a look at already sold articles on eBay serves; alternatively a sale to specialised collector dealers is possible.