A method of manufacturing a drug delivery device, comprising the steps of: (i) providing a drug delivery device comprising: - a drug reservoir or a compartment for receiving a drug reservoir, - drug expelling means comprising a dose setting member allowing a user to set a dose amount of drug to be expelled, - an indicator member adapted to rotate relative to the housing during dose setting and dose expelling corresponding to an axis of rotation, the amount of rotation corresponding to a set dose respectively the amount of drug remaining to be expelled from a reservoir by the expelling means, the indicator member having an initial rotational position corresponding to no dose amount being set, - a housing comprising a window allowing a user to observe a portion of the indicator member, the window being surrounded by an edge portion formed by the housing, - a pattern arranged circumferentially or helically on the indicator member and comprising a plurality of indicia (172, 176, 177), the currently observable indicia indicating to a user the size of a currently set dose amount of drug to be expelled, and (ii) arranging the indicator member in the initial rotational position, characterized by the further step of: (iii) providing on the housing and on the indicator member respectively a pair of zero markers (109R, 170R) having a predetermined rotational offset therebetween. (i) providing a drug delivery device comprising: - a drug reservoir or a compartment for receiving a drug reservoir, - drug expelling means comprising a dose setting member allowing a user to set a dose amount of drug to be expelled, - an indicator member adapted to rotate relative to the housing during dose setting and dose expelling corresponding to an axis of rotation, the amount of rotation corresponding to a set dose respectively the amount of drug remaining to be expelled from a reservoir by the expelling means, the indicator member having an initial rotational position corresponding to no dose amount being set, - a housing comprising a window allowing a user to observe a portion of the indicator member, the window being surrounded by an edge portion formed by the housing, - a pattern arranged circumferentially or helically on the indicator member and comprising a plurality of indicia (172, 176, 177), the currently observable indicia indicating to a user the size of a currently set dose amount of drug to be expelled, and - a drug reservoir or a compartment for receiving a drug reservoir, - drug expelling means comprising a dose setting member allowing a user to set a dose amount of drug to be expelled, - an indicator member adapted to rotate relative to the housing during dose setting and dose expelling corresponding to an axis of rotation, the amount of rotation corresponding to a set dose respectively the amount of drug remaining to be expelled from a reservoir by the expelling means, the indicator member having an initial rotational position corresponding to no dose amount being set, - a housing comprising a window allowing a user to observe a portion of the indicator member, the window being surrounded by an edge portion formed by the housing, - a pattern arranged circumferentially or helically on the indicator member and comprising a plurality of indicia (172, 176, 177), the currently observable indicia indicating to a user the size of a currently set dose amount of drug to be expelled, and (ii) arranging the indicator member in the initial rotational position,