Logo Variation For Laser

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This customer received 70 logo designs from 30 designers. They chose this logo design from sugan as the winning design.
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Logo Design Brief
We posted a project here a few weeks ago for a product logo using the characters "S7" and we had an excellent response.
Now we are looking for a logo to match the original. The logo will use the characters "SFS" or "SFC"
The new logo should be very very similar to the original S7 logo (attached) as it is a part of the same product family so when the two logos sit next to one another they should feel like they are related.
We really like the use of white space in the S7 version and it would be great to do the same with SFS or SFC somehow. The main "S" element is all that really needs to match though.
I've also attached the free font used in the original construction of the S7 logo.
Updates
Hello everyone. It appears the "SFS" version is proving to be quite a challenge to keep clean and match the original S7 logo. Therefore we have opened up the door a bit to allow the letters "SFS" OR "SFC" as the "SFC" option may result in a cleaner logo to match the original S7. Thank you!
Added Thursday, August 16, 2012
Industry/Entity Type
Construction
Logo Text
SFS or SFC
Logo styles of interest
Lettermark Logo
Acronym or letter based logo (text only)



Look and feel
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Upmarket
Requirements
Must have
- Must match the original S7 logo (attached) since this is for a product in the same family.
Only use white on black so we can compare easily.
Nice to have
- Use white space similar to how the S7 logo was created.
Should not have
- No color or greys. Only b&w.