Post Office/WHSmith Local postcard design

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This customer received 18 postcard designs from 5 designers. They chose this postcard design from alessandroevge as the winning design.
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Hi,
A post office is being relaunched next month and I want to kick start the social media side of the business off with a bang.
The name of the business will be 'Cheadle WHSmith Local Post Office'.
I just want to place 2 QR codes (which link to Facebook and Twitter) on the front and then some information on the back.
I have the QR codes already as PDF files.
I want to briefly tell the customer how to download a QR reader from their relevant smartphone app store.
Also that if they follow or like us they could win £100 of 'One4All' vouchers.
I don't really want to put any reference to the business on the postcard as that could deter them from doing it.
Target Market(s)
age range 18-50 to promote all aspects of the business
Industry/Entity Type
Business
Requirements
Nice to have
- Bright, colourful, assertive, happy
Should not have
- COMPANY LOGOS